You may find yourself unable to access WHMCS after enabling Cloudflare. WHMCS uses non traditional ports by default, but Cloudflare support these, along with a few more. Assuming your domain is "", please try one of the following to access WHMCS: or

If the above doesn't work, find clues in the DNS settings of your Cloudflare account, to guess under which record WHMCS is accessed. The corresponding URL might be: